Hair iron



FIG. 1 is a perspective view of a hair iron in accordance with the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. The broken lines shown in FIGS. 1-4 of the drawings illustrate portions of the article and form no part of the claimed design. 

The ornamental design for a hair iron, as shown and described. 